linux-kernel - Re: [PATCH v2 05/17] irqchip: Convert all alloc/xlate users from of

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Message-ID: <561E7545.9070305@arm.com>
Date:	Wed, 14 Oct 2015 16:31:17 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Jason Cooper <jason@...edaemon.net>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Graeme Gregory <graeme@...a.org.uk>,
	Jake Oshins <jakeo@...rosoft.com>
Subject: Re: [PATCH v2 05/17] irqchip: Convert all alloc/xlate users from
 of_node to fwnode

On 14/10/15 16:26, Tomasz Nowicki wrote:
> Hi Marc,
> 
> On 13.10.2015 13:51, Marc Zyngier wrote:
>> Since we now have a generic data structure to express an
>> interrupt specifier, convert all hierarchical irqchips that
>> are OF based to use a fwnode_handle as part of their alloc
>> and xlate (which becomes translate) callbacks.
>>
>> As most of these drivers have dependencies (they exchange IRQ
>> specifiers), change them all in a single, massive patch...
>>
>> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
>> ---
>>   arch/arm/mach-exynos/suspend.c       | 55 ++++++++++++++++---------------
>>   arch/arm/mach-imx/gpc.c              | 55 ++++++++++++++++---------------
>>   arch/arm/mach-omap2/omap-wakeupgen.c | 55 ++++++++++++++++---------------
>>   drivers/irqchip/irq-crossbar.c       | 62 ++++++++++++++++++----------------
>>   drivers/irqchip/irq-gic-v2m.c        | 18 ++++++----
>>   drivers/irqchip/irq-gic-v3-its.c     | 20 ++++++-----
>>   drivers/irqchip/irq-gic-v3.c         | 49 +++++++++++++--------------
>>   drivers/irqchip/irq-gic.c            | 33 ++++++++++++++++---
>>   drivers/irqchip/irq-imx-gpcv2.c      | 64 ++++++++++++++++--------------------
>>   drivers/irqchip/irq-mtk-sysirq.c     | 49 ++++++++++++++-------------
>>   drivers/irqchip/irq-nvic.c           | 18 +++++++---
>>   drivers/irqchip/irq-tegra.c          | 55 ++++++++++++++++---------------
>>   drivers/irqchip/irq-vf610-mscm-ir.c  | 42 +++++++++++++++--------
>>   13 files changed, 323 insertions(+), 252 deletions(-)
>>
> 
> [...]
> 
>>
>>   static int its_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
>> diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
>> index 5793880..05d010b 100644
>> --- a/drivers/irqchip/irq-gic-v3.c
>> +++ b/drivers/irqchip/irq-gic-v3.c
>> @@ -737,32 +737,30 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
>>   	return 0;
>>   }
>>
>> -static int gic_irq_domain_xlate(struct irq_domain *d,
>> -				struct device_node *controller,
>> -				const u32 *intspec, unsigned int intsize,
>> -				unsigned long *out_hwirq, unsigned int *out_type)
>> +static int gic_irq_domain_translate(struct irq_domain *d,
>> +				    struct irq_fwspec *fwspec,
>> +				    unsigned long *hwirq,
>> +				    unsigned int *type)
>>   {
>> -	if (irq_domain_get_of_node(d) != controller)
>> -		return -EINVAL;
>> -	if (intsize < 3)
>> -		return -EINVAL;
>> +	if (is_of_node(fwspec->fwnode)) {
>> +		if (fwspec->param_count < 3)
>> +			return -EINVAL;
>>
>> -	switch(intspec[0]) {
>> -	case 0:			/* SPI */
>> -		*out_hwirq = intspec[1] + 32;
>> -		break;
>> -	case 1:			/* PPI */
>> -		*out_hwirq = intspec[1] + 16;
>> -		break;
>> -	case GIC_IRQ_TYPE_LPI:	/* LPI */
>> -		*out_hwirq = intspec[1];
>> -		break;
>> -	default:
>> -		return -EINVAL;
>> +		/* Get the interrupt number and add 16 to skip over SGIs */
>> +		*hwirq = fwspec->param[1] + 16;
>> +
>> +		/*
>> +		 * For SPIs, we need to add 16 more to get the GIC irq
>> +		 * ID number
>> +		 */
>> +		if (!fwspec->param[0])
>> +			*hwirq += 16;
>> +
>> +		*type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
>> +		return 0;
>>   	}
>>
>> -	*out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
>> -	return 0;
>> +	return -EINVAL;
>>   }
> 
> What about GIC_IRQ_TYPE_LPI type? Previously we leaved interrupt line nr 
> and now +32.

Please see the patch I've posted earlier that address this particular issue:

https://lkml.org/lkml/2015/10/14/272

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...
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